Module: Parallel Processing
(c) 2001 by O.Conrad
Menu: Terrain Analysis > Hydrology > Catchment Area
Description
Parallel processing of cells for calculation of flow accumulation and related parameters. This set of algorithms processes a DEM downwards from the highest to the lowest cell.
References:
Deterministic 8
- O'Callaghan, J.F. / Mark, D.M. (1984):
'The extraction of drainage networks from digital elevation data',
Computer Vision, Graphics and Image Processing, 28:323-344
Rho 8:
- Fairfield, J. / Leymarie, P. (1991):
'Drainage networks from grid digital elevation models',
Water Resources Research, 27:709-717
Braunschweiger Reliefmodell:
- Bauer, J. / Rohdenburg, H. / Bork, H.-R. (1985):
'Ein Digitales Reliefmodell als Vorraussetzung fuer ein deterministisches Modell der Wasser- und Stoff-Fluesse',
Landschaftsgenese und Landschaftsoekologie, H.10, Parameteraufbereitung fuer deterministische Gebiets-Wassermodelle,
Grundlagenarbeiten zu Analyse von Agrar-Oekosystemen, (Eds.: Bork, H.-R. / Rohdenburg, H.), p.1-15
Deterministic Infinity:
- Tarboton, D.G. (1997):
'A new method for the determination of flow directions and upslope areas in grid digital elevation models',
Water Ressources Research, Vol.33, No.2, p.309-319
Multiple Flow Direction:
- Freeman, G.T. (1991):
'Calculating catchment area with divergent flow based on a regular grid',
Computers and Geosciences, 17:413-22
- Quinn, P.F. / Beven, K.J. / Chevallier, P. / Planchon, O. (1991):
'The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models',
Hydrological Processes, 5:59-79
Triangular Multiple Flow Direction
- Seibert, J. / McGlynn, B. (2007):
'A new triangular multiple flow direction algorithm for computing upslope areas from gridded digital elevation models',
Water Ressources Research, Vol. 43, W04501
C++ Implementation into SAGA by Thomas Grabs, Copyrights (c) 2007
Contact: thomas.grabs@natgeo.su.se, jan.seibert@natgeo.su.se
Parameters
Name | Type | Identifier | Description | Constraints |
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Input |
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Elevation | Grid (input) | ELEVATION | | |
Sink Routes (*) | Grid (optional input) | SINKROUTE | | |
Weight (*) | Grid (optional input) | WEIGHT | | |
Output |
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Catchment Area | Grid (output) | CAREA | | |
Catchment Height (*) | Grid (optional output) | CHEIGHT | | |
Catchment Slope (*) | Grid (optional output) | CSLOPE | | |
Catchment Aspect (*) | Grid (optional output) | CASPECT | | |
Flow Path Length (*) | Grid (optional output) | FLWPATH | | |
Options |
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Step | Integer | STEP | | Minimum: 1.000000 |
Method | Choice | Method | | Available Choices: [0] Deterministic 8 [1] Rho 8 [2] Braunschweiger Reliefmodell [3] Deterministic Infinity [4] Multiple Flow Direction [5] Multiple Triangular Flow Directon |
Linear Flow | Boolean | DOLINEAR | Use D8 if catchment area becomes higher than specified threshold. | |
Linear Flow Threshold | Floating point | LINEARTHRS | Use D8 if catchment area becomes higher than specified threshold (Cells). | |
Convergence | Floating point | CONVERGENCE | Convergence factor for Multiple Flow Direction Algorithm after Freeman (1991) and Multiple Triangular Flow Directon Algorithm after Seibert/Glynn (2007). | Minimum: 0.000000 |
(*) optional